This report summarizes the U.S. TAG effort to participate in the International Standards Organization Technical Committee (ISO/TC) 156 WG4 worldwide atmospheric exposure program. This program is being sponsored by ASTM Subcommittee G01.04 on Atmospheric Corrosion. This report lists the individuals responsible for supplying materials for this program and it identifies the individuals responsible for site exposures and withdrawals. It also provides specifications for the panel identifications, data sheets, and specimen exposure reports. Some of the initial data on panels in the program as well as the ISO report on the program are given in the appendices to this report.